Find the slope and the y intercept of the line

I'm terrible at math any here is appreciated.

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55